Firefighters are currently tackling around 40 straw bales and a muck heap which is on fire in Pulham Market, near Diss.
Appliances from Harleston and Diss were called at 2pm to the fire on farmland near Bush Green.
The crews are using jets to extinguish the fire and a Norfolk Fire and Rescue Service spokesman said good progress is being made.
The farmer is assisting the firefighters.
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